Great, but concept didn't quite work The film consists of two elements that are meant to work together. A documentary about a mysterious film that seems to bring bad luck or even death to its viewers, and the film itself, called "Antrum" (supposedly made in the 1970s, lost, then rediscovered with some mysterious elements added to it). Unfortunately while the film itself is great, and the documentary framing sequence is a decent concept, the two don't gel together very well.
"Antrum" on its own works quite well as a surreal 1970s horror film; one that depends on its mood and creepy story instead of gore, bodycount, special effects, etc. It works well on its own as a dark, tragic fairytale, or a child's nightmare. The conceit of the framing documentary seems to be there primarily as an excuse for making it a fake 1970s film, and for adding in some surreal distortions to the sound and imagery.
One unusual feature of the film is that at first seems to end on one tone (with a shot with the words "THE END" superimposed), but then after some strange imagery, the film continues to run, ending on a different tone.
There's also some mysterious "tampering" with the film (including flashes of violent imagery, and sigils) explained in the "documentary" as being added after the film vanished and before its mysterious reappearance. Unfortunately those splices seem unnecessary and do not add to the effectiveness of "Antrum" like some of its more surreal distortions do. I was hoping they could tie in things together better with the documentary, but other than returning to the documentary and matter-of-factly noting some of those edits, you wind up with nothing.
Ultimately, it seems like there's no reason why "Antrum" itself is cursed, and caused deaths before someone (or group) even got ahold of it and spliced things in.
The documentary provides a nice setup, but it doesn't really pay off, and when you return to the documentary at the end it just feels like a pointlees denoument (and I thought most of it would have worked better at the start of the film).
I feel that it would have worked much more effectively if, for example, the 70s film took an even stranger turn once its main narrative was completed, showing additional footage that was captured suggesting something happening to the actors while making the film (beyond just a few distortions) because they possibly unleashed something while filming, performing fake rituals, etc. There seems to be an abortive attempt at some points in that direction, but they seem to mostly give that upin favour the supposed later editorial intereference by persons unknown. In my mind, those splices actually took away from the notion that the film itself, when first released, was cursed and that what makes the film weird instead is what was done to it later.